Feature: Addition of more then one Font Family for Typography Theming

[mtpultz]

Bug, feature request, or proposal:

Feature

What is the current behavior?

Typography theming allows a single font-family to be chosen using $font-family in the configuration

What is the use-case or motivation for changing an existing behavior?

Most applications and sites use more then one font-family. Typically h1 and/or h2 ($title) headers use a second font-family, but other then creating a second config there's no way to override the $title with a second font-family. Something like mat-typography-level taking another parameter to override the font-family, or an new mixin that does both level and font-family so the mixin name more closely reflects it's use.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 4.2.5, Angular Material 2.0.0-beta.7, Windows 10

[jelbourn]

@crisbeto thoughts?

[crisbeto]

It definitely makes sense. It shouldn't be too much trouble to support since it can fall back to the main font family.